The application of impedance tensors decomposition to AMT data processing in Northern Guangxi area
KONG Zhi-Zhao1, 2, ZHAO Lu1, AI Hu1, WEI Bin1, WANG Ze-Xia1
1. Airborne Survey and Remote Sensing Center of Nuclear Industry, CNNC, Shijiazhuang 050002, China;
2. College of Earth Science, Jilin University, Changchun 130000, China
Some inversion errors may be caused either by the distortion effect of the localized conductivity heterogeneity or by the fact that line direction is not perpendicular to the structural strike in the AMT measurement. This study took Northern Guangxi area as the study area: The best orientation of principal axis was found by choosing suitable method to carry out the impedance tensor decomposition. The limited data were used to extract such information as one-dimensional and two-dimensional skew, and the dimensional characteristics of electrical structure were analyzed. Finally, the best orientation of principal axis was applied to the 2-D inversion, thus the resistivity inversion section that conforms to the actual geological conditions can be obtained. Drilling verification has demonstrated the effectiveness of this method, which can analyze the dimension characteristics of geo-electric structure better and identify hidden structures.
孔志召, 赵璐, 艾虎, 魏滨, 王泽霞. 阻抗张量分解技术在桂北地区AMT数据处理中的应用[J]. 物探与化探, 10.11720/wtyht.2014.5.30.
KONG Zhi-Zhao, ZHAO Lu, AI Hu, WEI Bin, WANG Ze-Xia. The application of impedance tensors decomposition to AMT data processing in Northern Guangxi area. Geophysical and Geochemical Exploration, 2014, 38(5): 1045-1050.
[1] 晋光文,孔祥儒.大地电磁阻抗张量的畸变与分解[M].北京:地震出版社,2006.[2] 陈小斌,赵国泽,马霄.大地电磁三维模型的一维二维反演近似问题研究[J].工程地球物理学报,2006,3(1):9-15.[3] 王书明.表面局部三维大地电磁曲线畸变校正——MT畸变校正阻抗张量分解方法[J].西北地震学报,1998,20(4):1-11.[4] Marquis G,Jones AG,Hyndman R D.Coincident conductive and reflective middle and lower crust in southern British Columbia[J].Geophys J Int,1995,120(1):111-131.[5] 蔡军涛,陈小斌,赵国泽.大地电磁资料精细处理和二维反演解释技术研究(一):阻抗张量分解与构造维性分析[J].地球物理学报,2010,53(10):2516-2526.[6] 何玉坤,张德会,黎建南.广西全州铀矿田流体地球化学及其成矿意义[J].地质与勘探,2010,46(4):671-680.[7] Swift C W.A magnetotelluric investigation of an electrical conductivity in the South Western Unite States[Ph.D.Thesis].Massachusetts Institute of Technology,1967.[8] Bahr K. Geological noise in magnetotelluric data: a classification of distortion types[M].Phys Earth Planet In,1991,66:24-38.[9] Bahr K. Interpertation of the magnetotelluric impedance tensor:regional induction and local telluric distortion[J].Geophys 1988,62:119-127.[10] Groom R W,Bailey R C.Decompositon of magnetotelluric impedance tensors in the presence of local three-dimensional galvanic distortion[J].Journal of Geophysical Research,1989,94(B2):1913-1925.[11] Groom R W,Bailey R C. Analytic investigations of the effects of near-surface three-dimensional galvanic scatterers on MT tensor decompositions[J]. Geophysics,1991,56(4):496-518.[12] Caldwell T G, Bibby H M, Brown C. The magnetotelluric phase tensor. Geophys J Int, 2004,158(2):457-469[13] Bibby H M, Caldwell T G, Brown C.Determinable and non-determinable parameters of galvanic distortion in magnetotellurics. Geophys J Int, 2005, 163(3):915-930.[14] 秦林江,杨长福,肖思东.大地电磁走向角确定及其对MT 响应函数的影响[J].石油地球物理勘探,2010(45):217-242.[15] Gamble T D, Goubau W M. Magnetotelluric regional strike[J]. Geophysics, 1982, 47(6):932-937.[16] Alan G J, Ross W G. Strike-angle determination from the magnetotelluric impedance tensor in the presence of noise and local distortion: rotate at your peril [J]. Geophysical Journal International, 1993(113):524-534.[17] 陈小斌,赵国泽,马霄.关于MT二维反演中数据旋转方向的选择问题初探[J].石油地球物理勘探. 2008, 43(1):113-118.[18] 柳建新,童孝忠,郭荣文,李爱勇,杨生.大地电磁测深法勘探—资料处理、反演与解释[M].北京:科学出版社,2012:112-134.[19] 王书明, 李德山, 胡浩.三维/三维构造下大地电磁相位张量数值模拟. 地球物理学报, 2013,56(5): 1745-1752.[20] 尹曜田,魏文博,叶高峰,金胜,董浩.基于遗传算法的大地电磁阻抗张量分解方法研究[J].地球物理学报,2012.55(2):671-682.[21] 王书明,李德山,胡浩.三维／三维构造下大地电磁相位张量数值模拟[J].地球物理学报,2013,56(5):1745-1752.[22] 谢成良,魏文博,金胜,等.相位张量分析约束下的大地电磁测深阻抗张量分解方法研究[J].地球物理学进展,2013,28(3):1208-1218.[23] 陈小斌,赵国泽,詹艳.MT资料处理与解释的Windows可视化集成系统[J].石油地球物理勘探,2004,39(s1)11-17.
